Multiple Outdoor Units: Possible Layouts - Daikin RWEYQ8T9Y1B Installer And User Manual

5 Preparation
Pipe
Longest pipe from the outdoor unit or the
last multi-outdoor piping branch (1+2, 1+3,
1+5)
Longest pipe after the first branch (2, 3, 5)
In case of a multi-outdoor setup: longest
pipe from the outdoor unit to the last multi-
outdoor piping branch (4)
Total pipe length
(a) If the equivalent piping length is more than 90 m, size up
the main liquid piping according to
piping size" on page 13.
Connection with VRV DX indoor units and Hydrobox units
a
4
3
b
b
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d LT Hydrobox unit
e HT Hydrobox unit
Pipe
Longest pipe from the outdoor unit or the
last multi-outdoor piping branch (1+2, 1+3,
1+5)
Longest pipe after the first branch (2, 3, 5)
In case of a multi-outdoor setup: longest
pipe from the outdoor unit to the last multi-
outdoor piping branch (4)
Total pipe length
(a) If the equivalent piping length is more than 90 m, size up
the main liquid piping according to
piping size" on page 13.
Installer and user reference guide
18
Maximum length
(actual/equivalent)
(a)
165 m/190 m
40 m/—
10 m/13 m
300 m/—
"5.3.2 To select the
1 2
c
5
e
d
Maximum length
(actual/equivalent)
(a)
120 m/140 m
40 m/—
10 m/13 m
300 m/—
"5.3.2 To select the
Connection with only VRV DX indoor units
a
4
3
b b
a Outdoor unit
b VRV DX indoor unit
c Multi BS unit
d Single BS unit
Pipe
Longest pipe from the outdoor unit or the
last multi-outdoor piping branch (1+2, 1+3,
1+5)
Longest pipe after the first branch (2, 3, 5)
In case of a multi-outdoor setup: longest
pipe from the outdoor unit to the last multi-
outdoor piping branch (4)
Total pipe length
5.3.6

Multiple outdoor units: Possible layouts

▪ The piping between the outdoor units must be routed level or
slightly upward to avoid the risk of oil retention into the piping.
Pattern 1
b
a
b
a
a To indoor unit
b Piping between outdoor units
X Not allowed (oil remains in piping)
O Allowed
▪ If the piping length between the outdoor unit connecting pipe kit or
between the outdoor units exceeds 2 m, create a rise of 200 mm
or more in the gas line within a length of 2 m from the kit.
▪ For the gas piping (both discharge and suction gas piping in case
of the heat recovery system) after the branch, install a trap of
200 mm or more using the piping included in the piping kit for
connecting the outdoor unit. Otherwise, the refrigerant may stay in
the piping, causing damage to the outdoor unit.
RWEYQ8~14T9V1B + RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
1 5
c
2
d
b
b
Maximum length
(actual/equivalent)
(a)
165 m/190 m
40 m/—
10 m/13 m
300 m/—
Pattern 2
b
a
b
a
4P452191-1 – 2017.04